1 Gregory_Pecarry 10 months ago I have a 1960 Silvertone H63, same as the Espanada, black with two P-13 pickups. It has no bracing on the back side of the top and some of the typical bridge sag you'd expect after 57 years. I'm in the process of making a shim to raise the bridge pickup to get similar output to the neck. I got to thinking after looking into various types of bracing on Gretsch guitars that a block similar to the one that bridges the gap between front and back in trestle bracing might help at least stabilize the situation, reduce likelyhood of feedback, and maybe help with tuning stability. I'd prefer something I could accomplish without taking the top or back off the guitar, go through the bridge pickup opening I think. I think I could use some plasticene to make an impression of top and back curvature to give myself some guidelines for the necessary size and shape. I'm guessing the gap is wider toward where I'd have to insert it through the pickup opening and narrows as I would slide the peice towards the bridge/tail hopefully finding its installation location near the bridge. Any advice?